Fix and enable SA1133, SA1134 style rules.

OpenRA.Mods.Common/Traits/Sound/AnnounceOnKill.cs

@@ -19,8 +19,9 @@ namespace OpenRA.Mods.Common.Traits.Sound
 		[Desc("Minimum duration (in seconds) between sound events.")]
 		public readonly int Interval = 5;
 
+		[VoiceReference]
 		[Desc("Voice to use when killing something.")]
-		[VoiceReference] public readonly string Voice = "Kill";
+		public readonly string Voice = "Kill";
 
 		public object Create(ActorInitializer init) { return new AnnounceOnKill(init.Self, this); }
 	}

OpenRA.Mods.Common/Traits/Sound/DeathSounds.cs

@@ -17,8 +17,9 @@ namespace OpenRA.Mods.Common.Traits.Sound
 	[Desc("Sounds to play when killed.")]
 	public class DeathSoundsInfo : ConditionalTraitInfo
 	{
+		[VoiceReference]
 		[Desc("Death notification voice.")]
-		[VoiceReference] public readonly string Voice = "Die";
+		public readonly string Voice = "Die";
 
 		[Desc("Multiply volume with this factor.")]
 		public readonly float VolumeMultiplier = 1f;

OpenRA.Mods.Common/Traits/Sound/VoiceAnnouncement.cs

@@ -16,9 +16,10 @@ namespace OpenRA.Mods.Common.Traits.Sound
 	[Desc("Plays a voice clip when the trait is enabled.")]
 	public class VoiceAnnouncementInfo : ConditionalTraitInfo
 	{
+		[VoiceReference]
 		[FieldLoader.Require]
 		[Desc("Voice to play.")]
-		[VoiceReference] public readonly string Voice = null;
+		public readonly string Voice = null;
 
 		[Desc("Player stances who can hear this voice.")]
 		public readonly Stance ValidStances = Stance.Ally | Stance.Neutral | Stance.Enemy;